We present the results of a two-point study of the topology and dynamics of high-altitude cusp regions under changing interplanetary magnetic field (IMF) direction. The study uses INTERBALL-1 and MAGION-4 measurements on April 2, 1996. An analysis of the MAGION-4 ion energy spectra indicates the presence of magnetosheath-like plasma well below the expected magnetopause position and a large region occupied by low-temperature dense plasma with the very low bulk velocity near the magnetopause. The examinations of two-point observations of the cusp-magnetosheath transition have confirmed our knowledge of the structure of a plasma entry region during stable IMF. Our study reveals a complicated topology of the magnetic field during cusp reformation from an initial to a final quasisteady state. We have found that such a reformation can take 10 - 15 minutes. © 2003 COSPAR. Published by Elsevier Science Ltd. All rights reserved.
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